Thread-intercutting tool.



J. VIDIN A. THREAD INTEBGUTTING TOOL. 'Arrmouro's num snrT.19.1so'r.

` Patented Dec. 29, 1908.,

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No. cereal.

l To all whom it may concermi y Beit known that I, JOSEPH VIDNA, a subu ject of the Emperor of Germany, and resid- Alng at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Thread-Intercutting Tools, of which Vthe following is a complete speciiication.

This invention relates to improvements in thread inter-cutting tools of thatvelass employed to inter-eutthe threads or provide cuttin edgeson a thread cutting die.

In orming thread cutting dies of that class in which the die is in the shapeof ya tube, split to provide a plurality of segments on which the cutting edges are formed, it has been customary to cut the threads on said segments of decreasing height from the forward edge of the segment to the rearward edge thereof, so as to provide the cutting edges at the forward edge. In large plants or machine shops a special machine is oft-- urpose, but such,

times employed for' this f machines are costly te bui d and can-usually be' employed but for the one purpose. In smaller plants it is customary to first thread the die and then cut awa the threads from the rear edge or portion of the segments with an ernery wheel or a file, but the operation is slow and it is diiicult to construct a true die in such manner. l

The object of this invention is to provide a very simple and cheaply constructed tool for inter-cutting the threads on a die so as to provide the cutting edges therefor and which can be attached to and o erated in an ordinary lathe, such as is founffin most work shops where such dies are employed or manufacr tured.

It is a further objectof the invention to provide a device capable of inter-cutting the threads on each segment of the die in succession and at the same depth by asimple adjustvInent and without removing the die there- Specfmation of Letters Patent.

Patented Dec. 29, 1908.

Appication led September 19, 1907. Serial No. 393,609.

more fully pointed out and defined in the ap ended claims.

n the drawings: Figure 1 is a side elevation, partly in section, of a de'.ice embodying my invention. Fig. 2 is an end ele-:ation of the same. Fig. 3 is a top plan view. Fig.

4 is a side elevation of the inter-cutting die.

Fig. 5 is a section taken online 5 5 of Fig. 3. As shown in said drawings: A indicates a barrel or sleeve of metal or any other pre-I ferred material and prozided on its under side with a stem a to which a horizontally directed clamp B is attached. Said clamp comprises a head split to provide clamping jaws b and hazing a bore therethrough for the reception of the stem a, and a bolt b passes through said jaws'and clamps them about said stern. Extending from said clamp, from the side opposite said jaws, is an integral bolt or shaft b2, shown in dotted lines in Figs. l, 2 and 3, and to which is engaged a horizontally directed clamping arm C. Said clamping arm is provided at one end with a "aw c adapted to engage the shaft b'-, and a holt c passes therethrough andI holds the jaw iirmly upon said shaft. The clamping attachment thus formed provides means for adjusting the sleeve upon both a horizontal and a vertical pivot. Said clamping arm may be rigidlyengaged to the cross slide D of a lathe in any preferred manner, as for instance, by a suita le clamp d, and an arm A', dove tailed at its upper end to the end of the sleeve A, extends downwardly from said sleeve and is bolted to the longitudinal slide D of the lathe, A set 'screw or bolt c is engaged in the stem a and extends downwardly therefrom and is seated on the slide D', and a set bolt a2 is carried in a lug ef* on the side of the sleeve A and extends downwardly and seats on the slide D. Said set bolts ac t to steady the device after it hasbeen secured in place upon the lathe.

Rotatively and slidably engaged in the sleeve A is a mandrel E, which is provided on its forward end with an enlarged head e adapted to abut against the end of the sleeve is screw threaded and a clamp or chuck head G is engaged thereon and is adapted to grip said die. As shown also said mandrel is provided with a bore e', and if preferred the clamp G may be carried on a shank adapted to be engaged in said bore. The rear end c2 of said mandrel is reduced inv size and screw threaded, and a disk H is slidably engaged thereon by means et a feather working in a groove e3 in said end e2. Said disk is pro vided in its periphery with a/plurality ot notches .7L in which a locking tl'ade H, pivoted in suitable ears h on the sleeve A, is adapted to engage and hohl the mandrel from rotation, but permitting longitudinal 1nove ment thereof.` A spring h2 is seated in the sleeve A beneath the pivoted. end of said blade and actsto hold it in adjusted position,

and a cross in h3 is enea ed in the other end` of the blade and serves as a handle. A nut h4 is engaged on said end e2, outwardly from the disk ll, and is adapted to permit said disk to be adjusted longitudinally of the mandrel. Any preferred means may be employed to rotate the mandrel, but, as shown in dotted lines, a belt pulley I is provided on the threaded end e2.

The operation is as follows: The device is vsecured to the lathe in such position that the longitudinalaxis of the mandrel is parallel with, but olf center from, the longitudinal axis of the rotative chuck J of the lbathe in which is carried the inter-cutting die y', which as shown is threaded at its end and grooved longitudinally of the threaded portion to provide the cutting edges therefor. The die F, having had its segments previously threaded, is secured to the mandreland the mandrel is locked from rotation by means of the blade H engaging 1n one of the notches of the disk H. The cutting die is of less diameter than the bore o'l the die ih, and the mandrel is sulliciently olf center With respect to the chuck to bring the intercutting die into cutting engagement with but one of the segments f at a time. The mandrel is moved slightly longitudinally by hand so as to bring the threads of the intercutting diointo engagement with. the threads of the segment, Where owing -to the fact that the inter-cutting die is olf center and is of less diameter than the internal diameter of the die F the threads on the former act to rut the threads of the segment deeper centrally thereoi, and at the same time draw the mandrel -forwardly, thereby affording the feed. inter-cutting die acts to cut the inner face of the segi'i'ient deeper at its center, so that the center of the segment is farther removed from the axis of the die than are the edges of the segment. When the inter-cut on one segment is completed the chuck is reversed, thereby returning the mandrel and .ln other words the' bringing the inter-cutting die out of engagement with the segment, The blade ll is then raised and the iandrel rotated suflieiently to bring the next notch. ot the disk beneath the blade which is then lowered thereinto. This adjustment brings the next segment inte register with the inter-cutting die and the operation is repeated.

If it is desired to use the die F for cutting threads on a bolt or the like, the blade ll is turned upwardly out of engagement with the disk and the mandrel rotated by means ot' the belt pulley.

The disk H is adjusted longitudinally of the mandrel to limit the length of the feed or put and it is adapted to contact with the sleeve A when the cut is completed.

Obviously a device constructed in aecordance with my invention affords a very simple and quickly acting thread inter-cutting tool and many details of construction and form may be varied without departing from the principles of my invention.

l claim as my invention:

l. l'n a device of the class described the combination with a sleeve of clamping means adapted to support the same in position, mandrel in said\sleeve adapted for longitudinal and rota-tive movement, a longitudinally adjustable disk on said mandrel arranged to abut the end of the sleeve and adapted to limit the longitudinal movement of the mandrel, and means adapted to engage with said disk and hold the mandrel from rotation. I

2. ln a device of the class described the combination with a sleeve of means adapted to su port said sleeve in position, a longitudinall' movable mandrel rotatively engaged in said sleeve, adjustable means on the mandrel adapted to limit the longitudinal movement thereof, and means pivot/ally engaged on said sleeve and adapted to engage said adjustable means and lock the mandrel from rotation.

3. In a device of the class described the combination with a sleeve of means supporting the sa me, a longitudinally and rotatably` movable mandrel in said sleeve, a head on one end of said mandrel adapted to limit its longitudinal movement in one direction, a notched disk adjustably engaged on the other end oi'v the mandrel and adapted .to limit its longitudinal movement in the other direction, and a blade hinged on the sleeve and adapted to engage in said notches and hold the mandrel from rotation.

4. fin a. device o'l'Y the Class described the combination with a sleeve ot means adjustably supporting the same, a mandrel in said sleeve adapted i'or both longitudinal and rotary movement and having a threaded end projecting from the sleeve, a disk slidably engaged on said end and adapted to abut against the sleeve and limit the lon tudinal movement of the mandrel in one reotion, means having threaded engagement on said end and adapted to hold said disk in'adjust- 5 ed osition and means adapted to engage the dis and prevent rotation of the mandrel.

` In Witness whereof I have hereunto sluit)- lWitnesses:

JOE HILL, B. ZEITZ.

JOSEPH VIDlNA 

